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Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
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IF THE SECURITY IS SET AND YOU DONT KNOW THE CODE YOU BETTER GO BUY A NEW RADIO,UNLESS YOU HAVE THE ORIGINAL PAPERWORK AND RECEIPT YOU WILL PLAY HELL TRYING TO GET THE UNIVERSAL UN LOCK CODE FROM KENWOOD,ONLY A KENWOOD AUTHORIZED SERVICE CENTER CAN OBTAIN THESE UNLOCK CODES,SO UNLESS YOU HAVE A FRIEND THAT WORKS FOR KENWOOD OR YOU GET LUCKY AND GUESS THE CODE I WOULD SUGGEST JUST GOING OUT AND BUYING A NEW ONE,WILL SAVE YOU A LOT OF FRUSTRATION AND HEADACHES.GOOD LUCK

SKY HAVE NOT PRODUCED A CODE FOR EITHER GU37HD OR THE FHD MODEL ,, DONT WASTE YOUR TIME TRYING CODES OR THE MANUEL SCAN NOTHING WORKS TAKE IT FROM ME 2 DAYS TRYING , AND AFTER CALLING GRUNDIG @ 10P A MIN FOR 20 MINS FOR THEM TO TELL ME ITS UP TO SKY TO MAKE A CODE ALL YOU CAN DO IS TO PRESSURE SKY INTO PRODUCING ONE FOR THE ABOVE TV'S. UNTILL THEN YOU WILL HAVE TO USE 2 REMOTES

I have this same TV and the input cannot be changed with the remote control. Some older universal remote controls can be used with TV. With the newer remoter controls the GE codes do not work and one must use the code scan search and hope that one of the other generic TV codes works (they usually don't). The motorola DRC800 universal remote that comes with some cableboxs will work with this TV when performing the universal code search. Good Luck. I'm junking this old TV and getting a new one as soon as I can afford it. (I bought new in 1994).

It sounds like you stereo did not retain it's memory during the battery change. Unless you have the code, or the serial number written down somewhere, you will have to remove the stereo and get the serial number off the unit to request a new one.